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  • C++运算符优先级表

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    Precedence

    Operator

    Description

    Example

    Associativity

    1

    ()
    []
    ->
    .
    ::
    ++
    --

    Grouping operator
    Array access
    Member access from a pointer
    Member access from an object
    Scoping operator
    Post-increment
    Post-decrement

    (a + b) / 4;
    array[4] = 2;
    ptr->age = 34;
    obj.age = 34;
    Class::age = 2;
    for( i = 0; i < 10; i++ ) ...
    for( i = 10; i > 0; i-- ) ...

    left to right

    2

    !
    ~
    ++
    --
    -
    +
    *
    &

    (type)
    sizeof

    Logical negation
    Bitwise complement
    Pre-increment
    Pre-decrement
    Unary minus
    Unary plus
    Dereference
    Address of
    Cast to a given type
    Return size in bytes

    if( !done ) ...
    flags = ~flags;
    for( i = 0; i < 10; ++i ) ...
    for( i = 10; i > 0; --i ) ...
    int i = -1;
    int i = +1;
    data = *ptr;
    address = &obj;
    int i = (int) float Num;
    int size = sizeof(floatNum);

    right to left

    3

    ->*
    .*

    Member pointer selector
    Member pointer selector

    ptr->*var = 24;

    obj.*var = 24;

    left to right

    4

    *
    /
    %

    Multiplication
    Division
    Modulus

    int i = 2 * 4;
    float f = 10 / 3;
    int rem = 4 % 3;

    left to right

    5

    +
    -

    Addition
    Subtraction

    int i = 2 + 3;
    int i = 5 - 1;

    left to right

    6

    <<
    >>

    Bitwise shift left
    Bitwise shift right

    int flags = 33 << 1;
    int flags = 33 >> 1;

    left to right

    7

    <
    <=
    >
    >=

    less-than
    less-than-or-equal-to
    greater-than
    geater-than-or-equal-to

    if( i < 42 ) ...
    if( i <= 42 ) ...
    if( i > 42 ) ...
    if( i >= 42 ) ...

    left to right

    8

    ==
    !=

    Comparison equal-to
    Comparison not-equal-to

    if( i == 42 ) ...
    if( i != 42 ) ...

    left to right

    9

    &

    Bitwise AND

    flags = flags & 42;

    left to right

    10

    ^

    Bitwise exclusive OR

    flags = flags ^ 42;

    left to right

    11

    |

    Bitwise inclusive (normal) OR

    flags = flags | 42;

    left to right

    12

    &&

    Logical AND

    if(conditionA&&conditionB ) ...

    left to right

    13

    ||

    Logical OR

    int i = (a > b) ? a : b

    left to right

    14

    ? :

    Ternaryconditional(if-then-else)

    if(conditionA||conditionB ) ...

    right to left

    15

    =
    +=
    -=
    *=
    /=
    %=
    &=
    ^=
    |=
    <<=
    >>=

    Assignment operator
    Increment and assign
    Decrement and assign
    Multiply and assign
    Divide and assign
    Modulo and assign
    Bitwise AND and assign
    Bitwise exclusive OR and assign
    Bitwise inclusive OR and assign
    Bitwise shift left and assign
    Bitwise shift right and assign

    int a = b;
    a += 3;
    b -= 4;
    a *= 5;
    a /= 2;
    a %= 3;
    flags &= new_flags;
    flags ^= new_flags;
    flags |= new_flags;
    flags <<= 2;
    flags >>= 2

    right to left

    16

    ,

    Sequential evaluation operator

    for( i = 0, j = 0; i < 10; i++, j++ ) ...

    left to right 



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  • 原文地址:https://www.cnblogs.com/engineerLF/p/5393142.html
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